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uml: signal handling tidying 

This patch tidies the signal handling code slightly.

pending is renamed to signals_pending for symmetry with signals_enabled.

remove_sigstack was unused, so can be deleted.

The value of change_sig was never used, so it is now void and the
return value is not calculated any more.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:31:16 -08:00 committed by Linus Torvalds
parent d7b88513c5
commit cfef8f34e7
1 changed files with 12 additions and 21 deletions
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33
arch/um/os-Linux/signal.c
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@ -63,7 +63,7 @@ static void sig_handler_common(int sig, struct sigcontext *sc)
#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
static int signals_enabled;
static unsigned int pending;
static unsigned int signals_pending;
void sig_handler(int sig, struct sigcontext *sc)
{
@ -71,7 +71,7 @@ void sig_handler(int sig, struct sigcontext *sc)
enabled = signals_enabled;
if (!enabled && (sig == SIGIO)) {
pending |= SIGIO_MASK;
signals_pending |= SIGIO_MASK;
return;
}
@ -99,7 +99,7 @@ void alarm_handler(int sig, struct sigcontext *sc)
enabled = signals_enabled;
if (!signals_enabled) {
pending |= SIGVTALRM_MASK;
signals_pending |= SIGVTALRM_MASK;
return;
}
@ -125,16 +125,6 @@ void set_sigstack(void *sig_stack, int size)
panic("enabling signal stack failed, errno = %d\n", errno);
}
void remove_sigstack(void)
{
stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
.ss_sp = NULL,
.ss_size = 0 });
if (sigaltstack(&stack, NULL) != 0)
panic("disabling signal stack failed, errno = %d\n", errno);
}
void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
void handle_signal(int sig, struct sigcontext *sc)
@ -213,13 +203,14 @@ void set_handler(int sig, void (*handler)(int), int flags, ...)
int change_sig(int signal, int on)
{
sigset_t sigset, old;
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, signal);
if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old) < 0)
if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, NULL) < 0)
return -errno;
return !sigismember(&old, signal);
return 0;
}
void block_signals(void)
@ -244,26 +235,26 @@ void unblock_signals(void)
/*
* We loop because the IRQ handler returns with interrupts off. So,
* interrupts may have arrived and we need to re-enable them and
* recheck pending.
* recheck signals_pending.
*/
while(1) {
/*
* Save and reset save_pending after enabling signals. This
* way, pending won't be changed while we're reading it.
* way, signals_pending won't be changed while we're reading it.
*/
signals_enabled = 1;
/*
* Setting signals_enabled and reading pending must
* Setting signals_enabled and reading signals_pending must
* happen in this order.
*/
barrier();
save_pending = pending;
save_pending = signals_pending;
if (save_pending == 0)
return;
pending = 0;
signals_pending = 0;
/*
* We have pending interrupts, so disable signals, as the